Glyoxal in aqueous ammonium sulfate solutions: products, kinetics and hydration effects.
Environ Sci Technol
; 45(15): 6336-42, 2011 Aug 01.
Article
em En
| MEDLINE
| ID: mdl-21721547
ABSTRACT
Reactions and interactions between glyoxal and salts in aqueous solution were studied. Glyoxal was found to react with ammonium to form imidazole, imidazole-2-carboxaldehyde, formic acid, N-glyoxal substituted imidazole, and minor products at very low concentrations. Overall reaction orders and rates for each major product were measured. Sulfate ions have a strong and specific interaction with glyoxal in aqueous solution, which shifts the hydration equilibria of glyoxal from the unhydrated carbonyl form to the hydrated form. This ion-specific effect contributes to the observed enhancement of the effective Henry's law coefficient for glyoxal in sulfate-containing solutions. The results of UV-vis absorption and NMR spectroscopy studies of solutions of glyoxal with ammonium, methylamine, and dimethylamine salts reveal that light absorbing compounds require the formation of nitrogen containing molecules. These findings have implications on the role of glyoxal in the atmosphere, both in models of the contribution of glyoxal to form secondary organic aerosol (SOA), the role of nitrogen containing species for aerosol optical properties and in predictions of the behavior of other carbonyls or dicarbonyls in the atmosphere.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Água
/
Glioxal
/
Sulfato de Amônio
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article